All animals must eat to survive. If you’ve heard the term “grazer” before, it may bring to mind familiar farm animals, such as cows or sheep munching on pastureland. But the ocean has its own suite of grazers, with very different — even bizarre — body forms and feeding techniques….

You think you’re so smart. Well, a wave of research into animal cognition reveals that just about anything you do, other creatures can do too. Sometimes, they can do it far better. To probe the nature of intelligence, scientists test animal skills and compare how different species think. A chimpanzee…